Ok I'm srry to burst all ur little bubles but one contrary to watnighthawklight said adding oven a miner amount to much fluid nomatter what u use for fuel it could still blow up I know because my little brother was killed when one blow up in hi hand oh and I've taken these kinds of weapons of inmates at my prion that have been used to kill people and are illegal nomatter what they shoot

Sorry, I deleted my first reply because I thought you were commenting on another project. Can you see the spark in the chamber? If it's bright neon blue that means you have too much fuel. If not, you probably don't have enough fuel.

Well, apparently this instructable has been up for a while, but i never saw it Dx WOnderful piece of work. I finished building mine, but only got it to shoot once... i see from other comments that fuel to air ratio is a problem, but have no grasp whatsoever of how much alchohol to apply... Any advice on that part?